Full Autos (K'NEX) Answered

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It isn't possible to make a blowback gun with K'NEX. Because we do not use explosives in guns, so we don't get the recoil. However, it is possible to make a machine gun out of k'nex with THIS DESIGN IN THE VIDEO. It's a basic setup: At first. A large wheel with pins sticking out rotates and pulls back the firing pin. After a while the firing pin will be released, letting the firing pin blow the bullet out of the barrel. If you continue cranking, this proccess will repeat, and there's your fully automatic gun. However, some k'nex guns are powered by firecrackers. But if you would use real bullets the barrel would explode from the extreme force.
(Sorry for ultimately long comment :P)

Doesn't work. Try applying some physics.
Newtons 3rd (I think) Law: Every action has an equal and opposite reaction.
So if the bands on the pin were stronger, the bands to push it back wouldn't be able to outbalance the pin bands, if the push-back bands were stronger the gun wouldn't fire, and if they were balances the pin wouldn't move at all.

no it wouldn't because the ram would apply say 5 newtons of force, and the rubberband would apply 5 newtons back onto it, but since the ram has more mass, it will force the rubberband back instead, not the other way around.

there are several ways to make a full auto gun.
1. use a motor to pull and release the ram
2. use a crank to pull and release
3. something I thought of that may work: hold a whole bunch of rubber bands ona spinning white connector, and have a mag that pushes the bullets up fast enough to recieve contact with each rubberband. it could work.
REMEMBER!!!!! NUMBER 3 WAS MY IDEA. JUST THOUGHT I'D SAY THAT.